I'd like to argue that Wikipedia also tries to be comprehensive within the limits of relevant topics. And overall, Wikipedia still seems to be going strong.
I'd argue that Wikipedia and its 'sister' projects have accidentally cannibalized a sizeable fraction of the former 'non-commercial, non-business focused' Internet of the 1990s and early 2000s. If you're providing information in a way that's not intended to further some sort of profit motive, it makes sense to work within that large established project because that maximizes the resulting exposure. The rise of LLMs only makes this starker, every LLM is trained from Wikipedia.
I'd argue that Wikipedia and its 'sister' projects have accidentally cannibalized a sizeable fraction of the former 'non-commercial, non-business focused' Internet of the 1990s and early 2000s. If you're providing information in a way that's not intended to further some sort of profit motive, it makes sense to work within that large established project because that maximizes the resulting exposure. The rise of LLMs only makes this starker, every LLM is trained from Wikipedia.